Dual Rotating Rings
FDDI provided an optional dual counter-rotating ring topology that contained primary and secondary rings with data flowing in opposite directions. If a line broke, the ends of the primary and secondary rings were bridged together at the closest node to create a single ring again.
Single Attached and Dual Attached
Nodes could be configured as Single Attached Stations (SAS) connected to concentrators or as Dual Attached Stations (DAS) connected to both rings. Groups of stations were typically wired to concentrators connected in a hierarchical tree to the main ring. Large networks could be configured as a "dual ring of trees," in which the dual ring provided the backbone to which multiple hierarchies of concentrators were attached.
MIC Connector
FDDI used a dual-fiber MIC plug and socket for connection to devices.
![]() | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2009 The Computer Language Company Inc. All rights reserved. |
Additional Resources
- Wireshark 1.2.4 (Mac)
- Wireshark is the world's foremost network protocol analyzer, and is the standard in many industries. It is the continuation of a project that started in 1998. Hundreds of developers around the world have contributed to it, and it is still under active development. Read/write many different aWireshark is the world's...
- Software downloads 2009-11-16
- FDD Tools 2.0 (Windows)
- FDD Tools - multi-platform Java based application supporting the Feature Driven Development FDD project management methodology. The application can be used to create/edit/display/print FDD-style progress tracking diagrams as described in the book "Java Modeling In Color With UML"Version 2.0 migrated to FDDI as the native file persistence format. Adds basic...
- Software downloads 2009-07-28
- Federal University of Sao Paulo Upgrades and Saves With Extreme Networks Gigabit Ethernet Solution
- The Federal University of Sao Paulo UNIFESP was running an obsolete Fiber Distributed Data Interface FDDI network that was continuously on the brink of crashing. Designed to serve just 200 users and connect only 46 computers, the system could no longer handle the demand generated by its 7,000 users, including...
- Case studies 2008-04-01
- A Study of FDDI and Ethernet Traffic on the LANL Network Backbone
- This paper discusses several network traffic traces taken on the Los Alamos National Laboratory backbone between 2001 and 2002. These traces, approximately 1.2 terabytes of binary data, will soon be released for public study in an anonymous form. This paper will discuss the collection methodology, tools, and an analysis showing...
- White papers 2007-02-05
- MCSE PREP TRAINING 4-PACK: Networking, Ethernet/802.3, Token Ring/FDDI and W2K (Mobile)
- For a limited time, SAVE 25% on four top MCSE handheld courses! An inexpensive way to obtain the industry's best training "on the go" when and where it's convenient for YOU!This 4-pack includes: MCSE PREP: Data NetworkingYOU WILL LEARN HOW TO:Define and understand Networking, LAN and WANBreak down and understand...
- Software downloads 2006-03-15
- CCNA PREP TRAINING PACK (Mobile)
- For a limited time, SAVE 25% on four top Cisco CCNA handheld courses! An inexpensive way to obtain the industry's best training "on the go" when and where it's convenient for YOU!This 4-pack includes: CCNA PREP: Data NetworkingYOU WILL LEARN HOW TO:Define and understand Networking, LAN and WANBreak down and...
- Software downloads 2006-03-15
- IT Essentials: MCSE, Comptia A+, CCNA - 11 Pack Bundle (PALM) (Mobile)
- This 11 Pack Includes:MCSE Prep: System RegistryUnderstand how the registry and the operating system interact Understand the registry tools available Edit registry entries Backup and restore the registryMCSE Prep: Network Infrastructure TCP/IPManuever the 4 layer protocol stack of TCP/IP Compare and contrast the OSI model and the TCP/IP DOD model...
- Software downloads 2006-02-13
- IT Essentials: MCSE, Comptia A+, CCNA - 12 Pack Bundle (PPC) (Mobile)
- This 12 Pack Includes:MCSE Prep: System RegistryUnderstand how the registry and the operating system interact Understand the registry tools available Edit registry entries Backup and restore the registryMCSE Prep: Network Infrastructure TCP/IPManuever the 4 layer protocol stack of TCP/IP Compare and contrast the OSI model and the TCP/IP DOD model...
- Software downloads 2006-02-13
- Study: Broadband leaps past dial-up
- Study: Broadband leaps past dial-upBig SurpriseWith getting web content getting slower and slower using dial people are bound to switch. I mean you want to down a MP3 off of a pay site you wait 20 minutes or more depending on the speed you get from you ISP and hope...
- Discussion threads 2004-08-18
- CCNA Training - LAN Media Access Control (Mobile)
- The most convenient way to learn the basics of Token Ring and prepare yourself for the CCNA Exam. CCNA certification training when and where you decide!YOU WILL LEARN HOW TO:Understand and define token access and frame types.Break down MAC management control processes .Utilize beacons and fault domains.Get the most out...
- Software downloads 2004-01-06
Premier Vendor Content Whitepapers, webcasts & resources from our Power Center Sponsors
- New Online Dashboard for IT Leaders
-
Read about top issues IT decision-makers face every day, plus get cost-effective solutions to real-life IT problems.
- Learn more >>
- The best support in the Linux business
-
If Linux is going to power your mission-critical applications, you'd better have the best support known to business. Novell was rated the top provider of Linux technical support.

- Learn more >>
- Learn more about tools to grow your business
-
The Business Essentials Guide provides you useful tools and templates to help grow your business and save you time with automated shipping solutions.
- Save time with the UPS Business Essentials Guide
- Keep Up With The Latest In Document Management with The DocuMentor.
-
Doc delivers the scoop on today's enterprise content management, printer maintenance, and all other issues related to document management. It's the DocuMentor Blog.
- Learn more >>
- Microsoft Dynamics CRM Online - Free Six-Month Trial for Eligible Organizations
-
Microsoft Dynamics CRM Online provides fast online access, simple contact management and better sales performance for a low monthly cost - the best value on the market today.

- Learn more about the free, six-month trial offer>>
Meet Doc
-
Here to help you with your Document Management Needs
- Doc is an enigma. Born to a Russian ballerina and a German electrical engineer, he grew up in various locations in the United States. He’s seen the insides of more brands, versions, and generations of printer and printer-related hardware than almost anyone.
- To learn more about this mysterious figure check out his blog on ZDNet and his Workspace on TechRepublic. You’ll be glad you did.
-
Produced by
ZDNet and






